<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>table</title>
  <link rel="stylesheet" href="style.css">
  <script src=""></script>
  <style>
    table { 
      border-collapse:collapse; /* collapse 使收缩 separate 分开的 */  
      border-spacing: 0px; /* collapse 使收缩时 0px 边框叠加  separate时 0px 边框贴合 */
    }
  </style>
</head>

<body>
  <table height="200px" width="300px" border="1px">
    <thead>
      <tr>
        <th>标题一</th>
        <th>标题二</th>
        <th>标题三</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1.1</td>
        <td colspan="2">1.2</td>
        <!-- <td>1.3</td> -->
      </tr>
      <tr>
        <td>2.1</td>
        <td rowspan="2" >2.2</td>
        <td>2.3</td>
      </tr>
      <tr>
        <td>3.1</td>
        <!-- <td>3.2</td> -->
        <td>3.3</td>
      </tr>
    </tbody>
  </table>
</body>

</html>